Service of locating

Hi Experts,
As I read here,
iphone uses several means to pinpoint location.
I need to clarify:
1. which way provides more accurate location info or all give exactly the same location everytime?
I mean, is wifi/cellular triangulation/GPS the most accurate?
If wifi is used, what/which map info database is used?
If cellular tower AGPS is used, what map info database is used?
If GPS is used, is it a 'live', real-time calculation service from the satellites?
Does the Cellular tower AGPS get data from satellites?
2. if at a location, the iphone GPS can access the satellites and the cell towers are also accessible. From which source will the location info be provided? Will iphone GPS still receive satellite map info if I leave the iphone at the same location for 15 mins or more? I know that cellular AGPS is quickest way to get location info. But if there is also GPS satellite line-of-sight, and i leave the iphone at the same location, will GPS info replace the AGPS info presented on the iphone? If so, how to tell if the map info I see comes from AGPS, GPS or wifi?
Where is the literature that explains clearly all these?
Message was edited by: catlover999
Message was edited by: catlover999

So, locating location by wifi or cellular network will provide exactly the same info because the database/info received is the same?
No. Again, the iphone has a dedicated GPS chip. WiFi & cellular tower location merely provide an assist in helping the GPS chip pinpoint your location faster than if the "assisted" part were not available.
If there is no line of sight from the satellite's point of view, eg. the iphone is inside a building, can GPS info still be received if wifi and cellular service is turned off?
All GPS receivers, including the iphone's, require line-of-sight reception to pinpoint your location. Generally, GPS receivers will not work inside a building.

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rekster9 wrote:
I'm trying to determine where services and programs are being launched from in Snow Leopard. Everywhere I read it says to look at /System/Library/StartupItems and in /Library/StartupItems.
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